Citation: Lisi Xu, Maosheng Li, Anqi He, Haijiao Xie, Kuirong Deng. F/N interface engineering of nonflammable polymer electrolyte for wide-temperature quasi-solid-state Li metal batteries[J]. Chinese Chemical Letters, ;2026, 37(2): 111815. doi: 10.1016/j.cclet.2025.111815 shu

F/N interface engineering of nonflammable polymer electrolyte for wide-temperature quasi-solid-state Li metal batteries

Lisi Xu ^a ,
Maosheng Li ^a ,
Anqi He ^a ,
Haijiao Xie ^b ,
Kuirong Deng ^{a, *,}

a.
School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, China
b.
Hangzhou Yanqu Information Technology Co., Ltd., Hangzhou 310003, China

dengkuir@wyu.edu.cn

Received Date: 15 July 2025
Revised Date: 26 August 2025
Accepted Date: 9 September 2025
Available Online: 9 September 2025

Figures(5)

Polymer-electrolyte-based solid-state Li metal batteries with high-voltage Ni-rich cathodes are promising energy storage technologies owing to their favorable security and high energy densities. However, operating in wide temperature range and at high voltage is a tough challenge for them. Herein, F/N donating fluorinated-amide-based plasticizers regulated polymer electrolyte capable of enabling high-voltage Li||LiNi_0.8Co_0.1Mn_0.1O₂ (NCM811) batteries with excellent performance in wide temperature range is developed. F/N donating fluorinated-amide-based plasticizers significantly improve ionic conductivity (1.52 mS/cm at 30 ℃), enhance oxidation stability (5.0 V vs. Li⁺/Li) and fabricate robust LiF/Li₃N-rich electrode-electrolyte interphases, which significantly improve the interface stability of Li metal anode and NCM811 cathode. The designed polymer electrolyte is nonflammable and has excellent dimensional stability at 200 ℃. Capitalizing on these advantageous attributes, the Li||NCM811 cells show excellent cycle stability and rate capability from −20 ℃ to 60 ℃ at high voltages (~4.6 V), and under high-loading full cell condition, which display impressive capacity retention of 84.4% after 1000 cycles and ultrahigh capacity of 154.8 mAh/g at 10 C. This work provides a rational design strategy of polymer electrolytes for wide-temperature high-energy solid-state Li metal batteries.
- Polymer electrolytes,
- Solid-electrolyte interphases,
- Fluorinated amide,
- NCM811,
- Li metal batteries
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